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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57a7dcfd981ecc3f15b6053dd9d3cb5a6186e7573404d5d4e9a8aedc1e086e32' 
  AND token = 'U7K0Jjbb2CQRPzw+IeQFJQw1Tcm26mMz2b4su7cF2h8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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