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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7a93f6ef354cb0dbf82bc60dae7654df733e3b9d1ec33679816bcf00019d2e9' 
  AND token = 'X5u80uukbn9h+61FeGIjf6E6jLduHBFHm5DZFL2PE80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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