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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56f44711dc7cd26389a29cb3a331d12204cd8166db7a6460c97a8ef6f12313d6' 
  AND token = '7Acu+LS986vZ68SltaY2ZaKLqcuQJYGe1cXM+Jx5vuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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