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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2c0027beb43f806d5d26bf3cbe882e27e35a90566f35d829cda8100c5ddb7ae' 
  AND token = '326eEd/IX/8NCaOOTq1nV2GU9fPNdN3cm7IbpPobCKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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