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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe6dadeba1261f39fc73566b0ac17889752939eb1d9b02beb5ed6c14400fde6f' 
  AND token = '4FZ8vUX2t37x3Mv66mHOZDCD7NSZ8LRAMnJdePYHljE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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