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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f54f91a7a6b18313a25b150eea787f591f7698c9d009a9c9a9fe3ff230ac9e12' 
  AND token = 'IMdiJVha4LD6a1VLFVzaH8w3Jz8oIFAMMbmH/3Z6lOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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