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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4960ae8e0348837a3b360d526ba399a7ae98afd5b008d52050c59fcc8ea3d230' 
  AND token = 'zUlWWd70uehwI9tK7JkxJwwv+vRsPI32catwEBCzypw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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