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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a06c6b031a6705e413fa1c31b9c2813db79b81a9f588084a708f2e970bb2d40f' 
  AND token = 'NW4i245aMRen2DzEcNH+cinTi06pXV/Eoa0pBgIl4hU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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