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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8113422416c003a72a85b37004a74507e6cbb27f2929cf1afb8e49b93d0da339' 
  AND token = 'D6TRR7mbHitzK8W6FqP2J88Y0MWDjYMJmVhOqafBFV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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