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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '880713c270a335fa016bda7658ee1ee9780c02325e0dcc875494f1e48952d282' 
  AND token = '5oPkV5Zh/g9BMA5dQjpI5nC/C3Zyl9qQquFFj+8poZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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