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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29f26047f71299d4fb33a9aeaf42e787489f354a4ee3c8d4b9128437b6d9ca02' 
  AND token = 'AD5yHIxNV6Az64LL5f1H5nHPuraaFjizvPoLHnPJUEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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