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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '613da9ca848ff0a7383ccc779a486d875f2b73b041d8fd3fcfa174ce07ae45ed' 
  AND token = 'EgtBXkpvLSJd8ubvKQoDTfCkuWKM49W3eBuWGB5E6YU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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