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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69c9d35a0981930b87c88b4226e8e6eadf739cae2da50d4fb76d5388d78d1e77' 
  AND token = 'E0Cei0KEoiyluzygfKtRDuJ+LbBeb8u/6yZjTT1OAFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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