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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f4fee2dcf96dd22bc5fe14036ba1db9f9883f1aff9e12508eaf6039b1954639' 
  AND token = 'CRRhyhR5W4WsOL1fQfGzcu3rmb3j7JpFilda1JkSc48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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