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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f7cbc1ba0974ffd7f39e3b492c7efd5dc3dfad95ae2431a618c09e568af617c' 
  AND token = 'RRrSo3HhejqiHgr5yFFz4awpXFT34ga4FdMBMC044HQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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