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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b4056b62959b7c9592178537e7d60f875675fd86fe47a0f80e5d0d981be2661' 
  AND token = 'JKt0526J77AhJzZ6DDFKMV+rSVcw1e+GO+DnQ9DBgo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00076

JSON explain

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