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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1559d80d7009bffa49ea95a51f9fd4f7005d0e6e3c791b608c2200bc4b054e08' 
  AND token = 'havVV2CMFX1cDtpO9spVMsDzHhdkSi8YsqG0Rnk7+60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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