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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82bada3d816e814c5f2651e4f44fec50e44772ef1d9be10e45bd355408f38d68' 
  AND token = 'hXtTT2qEZ/9FUyNdQB9ouwfSLhY10sJ8yxbeRJ1+WaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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