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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd795fab142443ca93f44f8519831f2ecaca70f13ccc019808df5d90e7b9b56ea' 
  AND token = 'cqy3DtfFnfORmihEeo3IhgDxNT8p5ApSCvybzvLxkVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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