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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41abbea38694d3af57ed217fdf2549bf67ec3abb8f1b37d1501518ec604f9f51' 
  AND token = 'UabG3E5bT5BiFEyKs/xlQ43HjyQrVaMsMZAnsl41QXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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