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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc101167939cafdc72878b28df570aa6aab9ddeec1f1101163b07e2382d0688b' 
  AND token = 'k54eWCjrcwArS5C0c+U3DwBE4tEJgh4C90Qlt3e6mTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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