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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e59c901fe79866d56af0f382d403ac39cb8ddd7e77cf839e50cb6279382763bd' 
  AND token = 'c+jPHhnNBz+1abnZZhN7mn//zGJ90/DhezvVeXeFEt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

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