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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36cd89f7cb3bf95eccfe2685551e2843f7d6c628274b8e232429a74d7be3c4ff' 
  AND token = 'yWivyODo++V3RKdiiqm7avNVwIXtwpfw50+jSjDqyfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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