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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c4e144f3d479502bf6156aa970d8b07d071d8ea4c771942b71c522a8367524e' 
  AND token = 'nDchAyAikwBT4OL9e9XuB5vxSOKokI8HMROapQHTLzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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