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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31050e6a014f4a20a2b00c715c42361b35111fe03e1bbe9be973cfee4714215a' 
  AND token = 'mw1fcQ0GZb0OY5C943hN9spUb/X8x+pxTD36fAKTMu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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