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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1195d5e0b592b89615442220da3bff44e1e380b4305eee91e273d334cc0ae59' 
  AND token = 'PcferwDj++xkXbtmy4JvW/zR3Nvc+Aggp3yvWuTV/x4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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