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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '098bf3d394e8c4c65f0d34f88bd4ef799ac9784bcb3d8d9e2734c06e6e5b89a8' 
  AND token = 'Uw5prelleqQDwKFQlJOSvDfKn/CwfTuCMayRKWt87Rg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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