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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee1ef5ca57da94cef6fa39cf94bb48dee4308ceb0f1b3c54abb14775f7d7c9a5' 
  AND token = 'EWqInc1baP8ag+aUAK0EgHM95irqigFJtzs3MokPBNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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