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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d0b19d5c021149e050492339004577096d742d688141fd50602bc19efc1c7ff' 
  AND token = 'Vd2bPSNoMHX30mwTRWbljQ0hWVJmi6V3tiN/ngMtKMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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