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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de9506fc68659ff3aa6a2cb680bc8adee315bee6e3e6aa4635f4aa9b14ca3f95' 
  AND token = 'Hfu4hzDMkWneXeSv9Xm6qnIsRutc6VanruVm30mfLsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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