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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bde58f18dc8f42a5ab5ae158eb4613d92048120aebeee65a898cdbc42a5d333' 
  AND token = 'WtY5pDreEHIJQX7wYhAj3Y1ATa3NwOsWGX9ulJ5Z2L4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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