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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f91bd4a22180705003771a3a605aa0887be13d7fbf41d36b5f30b2949d5f0ff3' 
  AND token = 'hSpAbABAgam6P2KiFbpmXGkzasTrM5tRuUUm6WRW0iM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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