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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70f05fa7ceb4a67e2f01bfc2b9baab13ee94e5c9e2422c58f162ad8083eb0d75' 
  AND token = 'pKiK1CC+OzU3OLHxop86zHosQrJZCbr3S6CRgUPOi3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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