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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71c2a7b9b231eeb78c094c19f6a328f3ccaba5a0f3fff0970b811c70e55d0c34' 
  AND token = 'L8JKvrnwNc3Jbu3OwMLP9O2LMX4NGkRN8IbVMji1kj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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