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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bcecb35fbb2a16470a85ff3b3174d35f892c2a80960e374456fbf1ab3d75215' 
  AND token = '6n+tBRF1SlyDaokkFFOzHYCIJYIp94oGS+ATf2jp7yk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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