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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c6e589b33956e85b3150c71726a8e199bda3fb7834667ff31482cbace5615fd' 
  AND token = 'VlhppxgfQiw5FmTktAQ7QSn9wFSBG6c9g1YglpveM4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00079

JSON explain

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