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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a17f330bfe22355780ca390c120a65a86ecb6108cbb8b43ed8382f1bbf882db0' 
  AND token = '+q2e+bWawhwYOFItOQHJSVSHdc8aHnTr5c1k+VsrskI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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