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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff009b1482135f6edbe99a1d245cf6dc1148363073aacd98c81ff046ef24ebe7' 
  AND token = 'Bp4eLDUUbQUsJI5f56NNjU9ZiQUmxi+mvdCL3TSgs0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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