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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0a05c3ac3103bbbb7e4c4e2f7dbdf546722a1c6bf0faa816871d8fcb6a842d7' 
  AND token = 'ky4CjorDiWlpZ6g1tZkUMdNejzWC+yuakv2VQb0nM+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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