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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12f5df661389c7c5c0babc0f18d6e9c6dc239e0b58fba7ef9311c659e65e5543' 
  AND token = 'ps2kPdX1Dt7yM5vrk8oksEwOtFIyGpkQ9/U8j6YhH8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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