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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c96b854007abf3b1d4035789e8924be1f7e102f3a3e2c5eb29de98b0ba0ba458' 
  AND token = 'X9wk1M+csv7VPuJu1dzNq8K6eb3+PAU+ZJq37Q3jM6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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