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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91ee9f125fbf53758834ebc34ee5a45f305e2427627223fba9162a84a3f958ff' 
  AND token = '+V4RRHS5n2sqP/c8YkRZQROO1FYdD6B8lh/9sL8NiJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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