SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5663b9a1af62593e713e14290c4fcbe1134163d25fdd17e1920407e9b1723586' 
  AND token = '38jTdNJMM8scAOe+RlDBKzgUVnqqH5/VEI5zjTBFNq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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