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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1403a56ac83e38058abf3ab715802dc36f2d5bed562b2991a79b1dbb7db93148' 
  AND token = '5JWPEE2qRG3kJtX+zSSGxWF5P1DHTCkr7mDfvuvhmSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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