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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad4bbf8d9717bc34c79e67f0ba15b055d8f8e805166a46913235466443565557' 
  AND token = 'Nkl6biw99vrckzjc0WI46+hIqbNPeniTWYGMe73nUW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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