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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dbbdff07bf4e069a2da5a31e2367ba623f65bd87fea0abd259953f3204afa00' 
  AND token = 'k4BflQVgvf1zEyIIqk9nQhrNS+jamp9C2l/pE/wPrKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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