SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa6ab2fba02fc7cc05df809875cf82748ffc42c95d6193dfd9bc22698224efd3' 
  AND token = '/uYR/HWVus6r/pLIGuZwACm8TuILrRZJ7ztmuKWwlvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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