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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4119321dcfcf88c5cf3214a3bc01dfd0a5ca0a8297d53a7679cb4bd06d7d3704' 
  AND token = 'fKMOk+tu1+2r870keMVrgcMa720jZl0hz6NGaCQ96gU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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