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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a82f4c5a266775c64526c4f32bef32eb798a356d44db4858b804c58d0868cfa0' 
  AND token = 'HZK+iOwGKeiKR5wSN+/bDvudivd0vW36+gVv87EpJ6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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