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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20784cf61141ca0661e75f3719ce0e32b994472c1d03ab943181b1a3d4db2b96' 
  AND token = 'zEfwMKWqt0PVuZJ4zV9wwz/P55ci+G3My+qeOWOrrSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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