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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7712de624f4476f175d903fcfffad32f605407b5b93e701677421f7ed94d422' 
  AND token = 'pk+aQRo5a8kbK/Mh792ECpqXVUoiA3aShCJETk/lmJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}