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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3e4d25caf01afaa351e24da151077855ae6abcb39999b77f9cf814657561cf6' 
  AND token = '4XeH2lcFqhFjjLEcJwtxo6Aw0pm2mI3pLu3ArbUCByI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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