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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76fae4b5037a3aba966bcd5c0c6d6743f8f17f61d401ad840857f614642159ae' 
  AND token = '+jKPsM5IkoCn1sn1ZEo6qWw5j0NTo0Yodk2For4t4zo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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