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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c08bdf66adcae16bdadee74266edbc3fc3845f6506a1bef4f6fb7d218d6f71b2' 
  AND token = 'MUfS25Q70s0WK6ONX7kKrRFg0H+VN+iQEi+HZIWfXkk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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