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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fea0c442b024aa2110093db79aa9268f37d7ecfe0d67f4de74b4dfa5ac0dd56' 
  AND token = 'yhjcOxLIY1eh8vGBch9ZM4KJJjK+pKDcuN5hGp9U5Ts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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