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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b18cc5ef7be64b16da8ee9011b692ca7f23b430c96bf6fe71555a332c0c7441f' 
  AND token = 'CSwG/2ZE6isOb1+dfgsO54URLuLr6G74Bp8Y6R7hDPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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