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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '407538d7b098d82b170ad101a5b0d44a8640dd67e8ec7a3f4a1e49fda5bbe9f8' 
  AND token = 'Z0vCZc2uhQ05moQjznslv79uy87vRHztwAyPVv+4eHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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