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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ede68e90fbcbad16a1e7cd5d6e469c8b9b5742d8491710a833b0c5adfd6bfcb' 
  AND token = 'CcN72kzUxL+Qw019S44FKu3EpIp9F4KSzoUHZsZSdrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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