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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59ca10d7298e44bdf609a848cd9b1908395567ad322ad1b884d6caf8984cab82' 
  AND token = 'UZPHWSuyx9mXJoAtof9h1TvnCr3ZmhQQhTyA2dLHc7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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